Critical Evaluation of the Compression Creep Test

The compression creep test is analyzed with respect to the friction at the loaded ends of the specimen. An analytical and a finite‐element solution performed for large deformations reveals that friction leads to a strain‐independent reduction of the creep rate which only depends on the stress expone...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1993-10, Vol.76 (10), p.2468-2474
Main Authors: Debschütz, Klaus D., Caspers, Bernhard, Schneider, Gerold A., Petzow, Gunter
Format: Article
Language:English
Subjects:
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
Chemical industry and chemicals
COMPRESSION
CREEP
DEFORMATION
Exact sciences and technology
General studies
MATERIALS SCIENCE
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
STRAINS
STRESSES
Technical ceramics
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
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Summary:The compression creep test is analyzed with respect to the friction at the loaded ends of the specimen. An analytical and a finite‐element solution performed for large deformations reveals that friction leads to a strain‐independent reduction of the creep rate which only depends on the stress exponent of the creep law and the geometry of the specimen. The assumed material behavior is a time‐dependent, isochoric, nonlinear viscosity. Compression creep tests on 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals (3Y‐TZP) have been analyzed. The determination of a stress exponent corresponding to the decreasing stress state in the specimen during large deformations results in a higher resolution of the stress–strain‐rate relationship derived from a certain number of creep tests. For 3Y‐TZP the compression creep tests reveal a decreasing stress exponent with increasing stress.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1993.tb03968.x